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CHAP. 54.—THE VARIOUS KINDS OF SAND. THE COMBINATIONS
OF SAND WITH LIME.

There are three kinds of sand: fossil1 sand, to which
one-fourth part of lime should be added;2 river sand; and
sea sand; to both of which last, one third of lime should be
added. If, too, one third of the mortar is composed of bruised
earthenware, it will be all the better. Fossil sand is found in
the districts that lie between the Apennines and the Padus,
but not in the parts beyond sea.

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